Which of the following describes a second-degree burn?
A. It involves only the epidermis.
B. It indicates the complete destruction of both the epidermis and dermis.
C. It probably will require a skin graft.
D. It involves the epidermis, part of the dermis, and may produce blisters.
E. The skin will not regenerate.
Answer: D
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Natural killer cells
A. only attack bacteria. B. are activated by IL-2 and interferon-gamma. C. cannot interact with antibodies. D. secrete interferon-gamma to activate helper T-cells. E. have primary responsibility for mass-manufacturing antibodies against foreign antigens.
The cranial and spinal nerves, autonomic nervous system, and ganglia make up the ________________________________________ nervous system
Fill in the blank(s) with correct word
During the cardiac cycle,
A. all four chambers of the heart are in systole at the same time. B. the right atrium and the right ventricle contract simultaneously. C. the left atrium contracts before the right atrium. D. the two atria relax while the two ventricles contract. E. all four chambers of the heart contract at the same time.
The size principle:
A. refers to the fact that large ? motor neurons are recruited before small ones B. refers to the fact that large and small ? motor neurons are recruited simultaneously C. predicts that ? and ? motor neurons are activated simultaneously during a movement D. predicts that ? motor neurons are activated before ? motor neurons during a movement E. is a consequence of small motor neurons being more excitable than large motor neurons